Grinding and polishing machine.



J. c. BLEVNBY.

GRINDING AND POLISHING MACHINE.

APPLIOATION FILED SEPT. 9, 1911.

rammed 11615.11, 1913.

5 SHEETS-SHEET l.

\ wf/vrai: 52; BZez/zly,

Mr/end@ Afro/mns WIT/VESSES: w f- Nonms Firms. INC Umm wAsmncmN D C J. C. BLEVNEY. GRINDING AND POLISHING MACHINE.

APPLICATION 'FILED SEPT. 9| 1911.

Patented Feb. 1 1., 1913.

.e mmm--- e. we E -me EL NUKE. im@ we e me f-- .9 ws @Sow n wm EN e J. G. BLEVNEY. GBINDING AND PoLIsHING MACHINE.

APPLICATION FILED SEPT. 9, 1911.

A TTORNEYS 5 SHEETS-SHEET a.

Patented Feb. 11, 1913.

/m/fmron. U25.; 0.326,07@

J. C. BLEVNEY. GRINDING AND POLISHING MACHINE. APPLIoAn'ox FILED snr'r. s, 1911.

Patented Feb. 11, 1913.

5 SHEETS-SHEET 4."

Nnnms PEYEns Inc Luna wAsmncwu D C V'un'bliigx 3is a detail plan v ieiv 'of the sii.

UNirED sTArEsPATENT oFFicE;

JOHNf BLE-ivivEY.,t 0F NEWARK, NEW .I

;clare thejollowing to'lv be afiill,-cle ar, `and exact Adescription`-of the invention,sueh as;

will enable otliers skilled in the art to which it apiirteins t0' makje arddlse. fhjm f lefr" erence being hadV `to the accoinpan ying drawings, and l to characters ofreference marked thereonwh ich form a, partei specification. i A

to improvements in -'grinding'and polishing machinery; and, the present ,invention has for fits' .principal .object to vprovide an eilig cient and automaticallyv operating grinding and polishing machine adapted, niore par-.`

ticularly, to grind' and polish-.objects liiijiiigf roundor cylindrical. surfaces, and to'. pro-l vide lsuch objects with .a smooth, vuniform and highly ,finis hed surface, free .'fro-in blemishes, burns, or buckling appearance.

The varioiisspecificobjects of the, pres-4 ent inventionA not attl-iis time` niorelparticularly Aenumerated will be c learl,`i f..under stood-from- -the following detailed descrip: tion of this invention.`

W ith thevarious objects of the ipiesie`lit4 'invention Ainwiew, the said invention `con-' 1 sists, primarily, in the novel lgrindiugand polishing machine` hereinafter lset forth; and, the invention consists, fiirthernrore. l in the novel arrangements Aand combinations of the several devices andparts,-aswel1as in the'details of the construction .of tlie. saine,

all of which willbe more fully Ldescribed in detail in the following specificationrand tlien nally embodied in the clauses of. theielams which are appended to. and 1whi cli'-for ni an esiiitial part of the. lsaid specification.

The invention i is clearly` illustrated i n the accompanying drawings, .in which z- Figures 1 and 2 are side elevations of the A respectivev 'opposite sidesof a 'grinding and polishing machine showing one embodiment of 'the principles of'the'present invention;

nected therewith, said view beingmade.onv

an enlarged scale'. Fig. 4 is a det'al cross Section taken on line 4-4 in said Fig. 3,

4verse tensioning the grindii'i'gelenien't or belt,

Speiiafion cite-tiennent.. Pafen'tediaeu.11,1913. appiiaeion aiedsepteaiber 9, 1911..'Y serial No; 648,525.'

direction of the arroivQ'l/. Slis 'a detaily side elevation and parti" longitudinal Ver tical sectionofl I l a rraiifity'f;'presser-foot,` inade its connection with' the lmachine, the saine being adapted to press the grinding element or 'beltagainst the material or objects which are 'to b e worked uponf; 7l is a trans'-y Aon an enlarged scale, and'rmovedi fromA tin being taken, onfliiie 7i-fin said `Fig'.

and Fig. 8 'a detail'p'crs ective view' illust-ratingl .the 4applicatio'nI ci) invention lhas reference, generally additional weightsto. said gravity presser-foot.' Fig. 9 `1s a` detail view illustratisngtlie method of and innig the pulleys' supporting the saine, 'said view being a means for ad] usting and al part a longitudinal Evertical sectionand in part an elefvationpto liio'ic clean-lv illustrate tlie'nieclianical features thereof;` Fig. 1Q is a detail I4vertical 'cross' section of tlie saniejrtaken oh'line itl-I iii said Fig. 9, looking in the direction'ofthe'arrmrafFig .ll is another cross/section of the saine,

taken on line 11`-l1 in said'Fig. 9. looking in the direction of the armw Zi: and Fi". 1:2.D is still another cross-section of the siiuic, said section being taken on line 12-12 in said'Fig. 9.`also looking in the lii'eetion'of said arrow b. Fig. 13 is a detail `view of part of `the power Ytransniission mechanism arranged and constructed lto operate tlie ivork'jsi'ipporting table and' said work-feeding or carrying iiieclianism connected therewith. Similar characters of 4reference are employed in all .of the said laboiedesciibed views. to indicate corresponding parts.

Referring now .to tlieaid drawing, the reference-character l indicates the Aframe ot the machine, and Q iiidicates the main driving shaft 'suitably supported 2in bear- .ing in the 'upper po rtion'of` said frame. Secured. upon one eiid-portioiiof said shaft 2 is aY pulley 3, over and around which passesa beltg fondriving the machine.

"vertical section-ofthe saine, said sec- `Suitably secured `upon saidgdrivingsliaft 2 is driving pulley'. Extendingfroin-the upper portionI of said framed are oppo- .sitely directed arms. 6A and 6i in which are respectively. supported suitable bearing- Abrackets 7 and 7?, andadjustably carried :by the said bearing-bracketsfare the respec- The reference-character 10 indicates 'a suitable, belt which .passes around the said driving pulley 5 and said pulley wheel 9, this belt being mafie of leather or any other desirable material, and .carrying upon the surface thereof a series of transverse and raised portions or projections, as 11, which alternate with a series of depressions, as`12. Extending around the said pulleys 9 and 9,

-outside of the belt 10, is a grinding belt 13,

said belt 13 being preferably made of a suit able fabric, such as cloth or a webbing, and the outer surface of which is covered with a as emery.

The proper tensioning of the respective belts 10 and 13 isV automatically regulated and maintained by the following means Each bearing-bracket 7 and 7* is provided with a rearwardly extending bracket-arm` 14 having suitable guide-members 15 which are slidably supported in guide-ways 16, with which the respective arms 6 and`6 of thesframe 1 are provided. Suitably secured to the said bracket-arms is a rack-member 17, and journaled in suitably disposed bearingportions 18, with which the respective arms 6 and 6 are proivded, is a shaft 19, upon the inner end of which is mounted a spur gear 20 which is in operative engagement or mesh with the said rack-member 17. Journaled upon the outer end of said shaft 19 is alever-member 21 carrying at one end thereof a toothed dog 22 which is pivotally connected therewith. The said toothed dog 22 engages the teeth of a second spur gear 23, also secured upon the outer end of said shaft 19, and being loca-ted adjacent to the said lever-member. Adjustably secured upon the opposite portion of said lever-.member 21 is a weight 2 4.

The herein-above described parts operate in the following manner t--The said weight 24 operates to oscillate the said lever-member 21 upon said Shaft 19, as its'fulcrum, the movement of said lever being transmitted through the'said toothed dog 22 to the said spur gear 23, which in turn rotates said shaft 19 and the spur gear 20, the latter operating upon the rack-member 17 .so as to move the same and the bracket-arm 14 t o which it is secured in an outward dlr rect-ion, thereby carrying outwardly the bracket-bearing and the pulley wheel supported in connection therewith. .It will thus be clearly apparent, that the movements of the respective pulley wheels 9 and 9*, thus effected, are in opposite directions, whereby the-respective belts 10 and 13 are 'stretched and maintained at a desired tension. The toothed dogs 22. may be caused to engage with respective spur gears in such a manner so that the position of said lever-member 21 may be adjusted to make use of the force ofV gravitation,- and so that the latterwill properly operate upon said weights to produce the herein-above described operation of the tensioning mechanism. It will also be evident, that the saidvweights may be shifted upon said lever-members so as to increase or decrease the leverage of the same, and in such a manner secure the desired degree vof tension in the lsaid belts l0 and 13. To the end that a proper alinement of the belts 10 and 13 may be obtained, as they run .over their respective pulleys, the said bearingbrackets 7 and 7'L 'are adjustably secured to their respective bracket arms 14, this adjustment being effected by providing each bracket-arm 14 with a head-flange 25 which is provided with suitably disposed slots 26, which allows of a proper adjusting movement in a vertical plane to be made lover the bolts 27 by means of which the Asaid bearingbrackets are secured to said head-flange. It is also desirable to secure an adjustment of said pulley wheels9 and,9 in a horizontal plane to insure a 'proper running of the respective belts 10 and 13. To this end, the said bracket-bearings ,7' and 7 are provided with stationary bearing-blocks 28 and with movably disposed bearing-blocks 29, in which bearing-blocks the end-portions of the respective shafts 8 and 8? are supported, the movements of said slidable or movable bearinglblocks 29 being effected by means of adjusting screws 30, the said bearingblocks 29 and theA portions of the shafts supported in said blocks,if desired, being internally screw-threaded, so' as to receive the said adjusting screws. The free end-portion of each adjusting screw 30 bears against the end of the opening in each bracket-bearing in which the said bearing-block is arranged, so that by turning the screw, by means of its hand-wheel 31. the ,screw will move said bearing-block, as desired. Each adjusting screw 30 may also be provided with a lockwheel or nut, as 32, which is threaded so as to ride upon the adjusting screw, and to lockthe same when the desired adjustment has been obtained, in a manner that will be clearly obvious from an inspection of the said parts, as illustrated inthe several figures of the drawings.

In the arrangement of the respective pul ley wheels over which the belts 10 and 13 travel, it is desirable to so arrange the same with relation to each other that the grinding belt 13'is driven by its contact with the belt 10, at a point where the said belts pass over the pulley wheel 9; and, furthermore; the respective belts are permitted to run in contact with each otheronly at the place where which is internally screw-threaded adjacent to its lfree end, so as to thereby provide a bearing for a screw-threaded standard 34. The lower end ot this screw-threaded standard is provided with a suitable hand-wheel 35, for the proper manipulation of the same. Secured upon the upper end of said screwthreaded standard, in any desired manner, is a longitudinally extending table-beam 36 which is provided with transversely and horizontally extending supporting arms 37 and 37a. The reference-characters 38 and 38a indicate suitably formed bed-brackets, each bracket having a pair of downwardly extending portions 39 which terminate in bearing-pieces 40, and which respectively slidably engage with the said respective supporting arms 37 and 37a. Suitably supported by the respective bed-brackets 38 and 38a is a longitudinally extending work-supporting table 41 which is arranged in such a. manner so that it extends beneath the said grinding belt 13 wiere the latter is present-,

bracket 38a, and which forms the pivot of the adjustable relation of the said table, and a lock-bolt 43 being employed,said bolt operating through a slotted plate 44 alixed to said table, for securing the said table in its desired adjusted position to the said bed- .braekct 38. The reference-character 45 indicates a pulley which is secured upon said main driving shaft 2 and over which runs4 a belt 46 for driving a larger pulley 47 which is secured upon a counter-shaft 48, and which shaft'is` journaled in suitable bearings in the lower portion of the frame 1. Connected with the said frame 1 is an outwardly extending arm 49 upon which is secured in any desired position and is capable of longitudinal adjustment thereon a bearing1nember.50. said member 50 being provided with a suitably constructed yokeshaped portion 51, and with which is connected a pivot-pin or post 52. Arranged in the said opening ot the yoke-shaped portion and pivotally connected with the said pivotpin or post 52 is a bearing-block 53 in which is journaled a counter-shaft 54. The said bearing-block 53 is capable of being moved upon said pivot-pin or post in a horizontal plane to adjust the counter-shaft 54 and the pulley' 55 secured thereto, this movement of' the said bearing-block being accomplished by means of set-screws 56 arranged 1n Ithe side-walls of the said yoke-shaped portion 51. The said counter-shaft 48 is provided with a small pulley 57 over which runs a belt 58 by means of which the said pulley 55 and the counter-shaft 54 are driven.

The reference-character 59 indicates a transversely arranged shaft which is journaled in a bearing-member 60 connected with the previously mentioned table-beam 36. Secured to one end of said shaft 59 is abevel gear 61 which meshes with another bevelegear 62 suitably secured upon a shaft 63. The respective bevel gears 61 and 62 are inclosedA in a suitable casing, as 64, adapted to swivel upon one end ot the said bearingmember 60, another portion of said casing forming the bearing in which said shaft 63 is journaled at one end. The said shaft 63 is journaled at its opposite end in a portion of another gear-casing 65, adapted to swivel upon the shoulder 53a of the bearing-block 53, and which contains another pair of intermeshing bevel gears, similar in arrangement to the said bevel gears 6l and 62, one of said bevel gears being secured to said shaft 63, and the other bevel gear being secured to the said counter-shaft 54. It will be apparent. that when the table-beam 36 is raised or lowered to adjust the position of said work-supporting table with relation to the said grinding belt 13, the power transmission elements adapted to drive said shaft 59 will easily adjust themselves in their driving relation to any raised or lowered position of said beam 36, since the 'bevel gear) connections will roll upon themselves to permit the vertical adjustment, and said counter-shaft 54 being supported in a bearing block adapted to swing on the pivot-pin 52, the same will easily follow the consequent adjusted position of said shaft 63. Secured upon the opposite end of said transverse shaft 59 is a worin 66 which meshes with and drives a worm-wheel 67, the shaft. 68 of which is journaled in a portion of a casing-member 69, enveloping said worm and worm-wheel, said casing-member being supported by securing the same to one end ot' said bearing-member 60.

lt is desirable that the work-supporting table 41 shall have a transverse reciprocating movement. duringthe operation of the machine, to the end that the work to he ground or polished may be carried in contact transversely with all portions ot the grinding belt 13. so that the entire grinding etlicieucy of the belt may be utilized and the same prevented from streaking or wearing ot in limited portions ot' its grinding surface, instead ot being unitormly and evenly worn off. To accomplish this result. there is provided a longitudinally extending rock-shaft 70, which is supported by means of shafthangers 71, depending from portions of the said supportingr arms 37 and 37. Secured in proper locations upon said rock-shaft 70 are suitable lever-arms 72 and 7 2, said arms being pivotally connected with the respective bed-brackets 38' and 38a by means of connectng rods 7 3 and 7 3a. Secured upon said rockshaft is a rocker-arm 74 which is provided with an anti-,friction roller 7 5, said `anti-friction roller being in operative engagementwith the cam-surface of a rotating cam-member 76, aixed to and rotated by the said shaft 68. This cam-member tends to reciprocate said rocker-arm 74, so as to oscillate the said rock-shaft 70 and leverarms 72 and 72a, and the latter operating through said connecting rods 73 and 73a, slide the said bed-brackets 38 and 88a back and forth upon said supporting-arm 37 and 37, and consequently reciprocate the worksupporting table 41 in transverse directions. Secured to said rock-shaft 70 is an outwardly extending arm 77, provided with a counter balance weight 78, which tends to maintain said rocker-arm 74 in constant engagement with said cam-member 7G by oscillating said rock-shaft in the opposite direction during the slacking movement of said cam-member, and ther'eby assists in producing the reciprocatory movement of said work-supporting table. The said work-supporting table is provided with means for carrying the work to be ground or polished beneath the grinding belt 13. This means comprises a longitudinally extending shaft 79, journaled in suitably disposed bearings 80, so that the said shaft will extend along one side of said work-supporting table. Secured at suitable intervals upon said shaft 79 are a plurality of bevel-gears 81, and mountedso as to swivel upon said shaft 79 between the bevel gears 8l are sleeves 82 which are provided with olf-set socket-bearings 83.

The reference-character 84 indicates a plurality of obliquely or diagonally disposed carrier-shafts, one end of each shaft being journaled in a socket-bearing 83, and the other end of each shaft being journaled in an open bearing-member 85, a number of such members 85 being secured adjacent to the opposite side of the said work-supporting table. Each of said carrier-shafts 1s provided with a pluralit \7 of carrier-wheels 8G which are secured to said shafts, so as to be rotated thereby, and each wheel is provided with a cushioning or flexible periphery, such as a rubber or felt ring 87, or other suitable means. Said carrier-sliafts- 84 are also provided with bevel gears 88, which mesh with bevel-gears 8l, whereby the said carrier-shafts are rotated upon the rotation of said shaft 79. Located adjacent to each end of said series of carrier-shafts 84 are a series of idler carrier-shafts 89, journaled in open bearing members 90, the same being arranged to extend. obliquely or diagonally across the work-supporting table,

and each being provided With carrierwheels 91 of the same description as those hereinbefore set forth. The Work to be ground, such as cylindrical tubes or rods 92, is supported upon said carrier-Wheels in the manner illust-rated in Figs. 1, 2 and 4 of the drawings, so as to straddle two adjacent carrier-wheels .upon each carriershaft. Upon the revolution of the carriershafts 84 and their carrier-Wheels 86, the said tubes or rods 92 are carried forward beneath the grinding belt 13. In addition to the forward movement thus produced, the said tubes or rods 92 are also rotated upon their longitudinal axis, due to the oblique pitch of said carrier-wheels, all in a manner which will be clearly obvious from an inspection of the several figures of the drawings. -rhis combined forward and rotary feeding movement of said tubes and rods 92, tends to present all parts of the surfaces of the same to the abrading action of the grinding belt, so as to produce a uniform and completely ground and finished surface.

It will of course be evident, that when it is desired to operate upon tubes or rods of various diameters, it is necessary to set the said carrier-wheels 86, either closer t0- gether or farther apart, in accordance with the diameter of the tubes or rods to be operated upon. To accomplish this end, the said carrier-shafts areconstrueted and assembled so as to be removable, by lifting one end of said carrier-shafts out of the open bearingmembers 85. The socket-bearing 83 at the other end swings upwardly, owing to the pivotal relation of the supporting sleeve 82 to the shaft 79, and thus said carrier-shafts may be pulled out of said socket-bearings 83, to thereby disengage the bevel gears 88 from their meshed relation with the bevel gears 81. In this manner, said carrier-shafts 84 are made interchangeable` so that a carriershaft possessing properly disposed carrierwheels is adapted to be accommodated to the diameters of the tubes or rods to be ground, when arranged upon the work supporting table. Of course` if desired, the carrierwheels may be adjustably secured upon said carrier shafts so as to secure the same result. The means for rotating said shaft 79 and thereby to operate said carrier-shafts 84 comprises the following elements -Secured upon s-aid work-sul'iporting table. in a proper position, is a bearing-member 98 in which is journaled a shaft 94 which is provided with an outwardly extending and preferably squared extension or tail-piece 95. F1Xed upon said shaft 94 is a bevel-gear 96, and also fixed upon one end of said shaft 79 is a driving bevel-gear 97. Mounted upon the table are a pair 0f bearings 98 and 98a in` which is journaled a shaft 99, capable of longitudinal movement in said bearings.

Secured to one end of Said shaft 99- is a clutch `bevel-gear 100, normally in mesh upon either side with said bevel gear 96 and said driving bevel-gear 97, whereby the rotation of said shaft 94 is transmitted to said shaft 79. A rearward sliding movement of the -said shaft 99 in its bearings disengages said clutch bevel-gear from its above described interineshing relation with saidbevel-gears 96 and 97, and thereby arrests the feeding movement of said carrier-shafts. Said shaft 99 is 'provided with a lock-member 101 which is pivotally secured to the outer end of said shaft 99, said lock-member 101 extending over the bearing-member 98, and being providedv with a perforation 101a in its upper portion, adapted to be engaged by a stoppin 102, whereby the said lock-member is held in such a position, that it will maintain said shaft 99 in position to present the clutch bevel-gear 100 in its meshing relation with said bevel gears 96 and'97. By lifting said lock-member and swinging t-he same upon its pivot, to disengage thesame from said stop-pin, the said shaft 99 may be drawn backward so as to -disengage said bevel-gear V100, which positionv of the shaft 99 is maintained by bringing into engagement with, said stop-pin a notch or second perforation-101b with which said lock-member is provided. Secured to one end of said supporting rod 37 is an upwardly extending bracket-arm 1031 said arm having at its free end a beati U-portion 104 in which is journaled the hu 105 of a variable speed-belt pulley 106. Said belt-pulley 106 has a fixed rotary relation to said bearing-portion 104, and the same is provided with a squared openinf-Y through which passes the said square extension or tail-piece 95 of the lshaft 94, so that the said tail-piece has a longitudinal play through said pulley 106, while receiving rotating impulse therefrom; hence, permitting the continuous operation of said carrier-shafts andl their driving mechanism, notwithstanding the transverse reciprocatory movement of said work-supporting table carrying the same, as hereinabove described. The reference-character 107 indicates a driving'variable speed beltpulley which is secured upon and is driven by said transverse shaft 59, and which, by means of a properly arranged belt connection 108, drives the said belt-pulley 106. Y The reference-character 109 indicates the supporting frame-work of a gravity or presser-foot mechanism which is connected with the arm 6 of the machine-frame 1, so as to present said presser-foot mechanism above saidsuperimposed belts 10 and 13 at a point where said grinding-belt comes in contact with the work to be ground. The object of said presser-foot is to yieldingly press said grinding belt against the work, and thus assure the efficient operation of the .the same being capable of free vertical ,through perforations with which the u -in proper positions, a series of retaining fingers. 114, and arranged upon said-carryingrods are a plurality ofrpresser-Weights 115, Play upon said rods, but being prevented from moving longitudinally by means of said retaining ingers 114, which project upwardly Per portion of eachpresser-weight is provided. The presser-wei hts arranged on one carrying rod are pre erably staggered as to their positions with relation to the presser-weights carried by the adjoining carrying rods. It

will be apparent, that when said presserweights are brought in contact with said belts 10 and 13, they will exert, byreason of the gravitation of the weights, a ielding pressure upon Vall portions of the be ts passcausedto bear properly upon the somewhat uneven surface which is presented bya series of tubes or rods 92 which are carried into contact with said grinding belt by the workfeedingmcchanisin. there the pressure of the fixed presser-weights is less than desired, such pressure may be increased by means of the auxiliary presser-weights 116, which may be built up upon the fixed presserweights, and are retained in their operative relation therewith, by means ofthe said retaining fingers 114, in the manner illustrated in Fig. 8 of the drawings. Of course it will be evident that one or more of said auxiliary presser-weights may be added to the fixed presser-weights, as the occasion 'ma de- 'mand. Said rectangular fiame 110 is arranged and supported in such a manner, in its relation with the frame-work 109 that the same may be lifted to remove the pressearweights from operative contact with said belts 10 and 13. To this end, there is provided a shaft 117 having eccentric or camshaped portions 11S, which are journaled in a suitable manner in the upper portion of said frame-work 109. Connecting said shaft 117 with a pair of opposite studs 111 of said rectangular frame are a pair of supporting links 119. A handle-member 120 is secured to said shaft 117, by means of which said shaft may be rotated. Upon rotating said shaft 117, the eccentric or cam-shaped portions tend to raise the shaft, and such upward movement is transmitted to said rectangular frame 110, by means of said supporting links 119, said rectangular frame ing thereunder, so that said grinding belt is being guided in its vertical movements by said studslll which ride in the slots 112 of said frame-work 109.

stood from said specification, and an inspec-V tion of the illustrating drawings, without the necessity of further description.

As many lchanges 'may be made in the above described construction of my invention and its detail parts, and many apparently widely different embodiments of my invention could be made without departing from the scope thereof, I'intend that all matter contained in the above description or shown in 'the accompanying drawings shall be interpreted as illustrative arid not in a limiting sense. Y I desire it alsoto be'understood that the language used in the followiiig'cla'iiiis is intended to cover all genen", and specific features of the invention herein described and all statementsY of the scope of the invention, which, as a matter of language, might be said to fall therebetween.

`Hence, I do no t limit my present invention to the exact arrai'igements and combinations of the devices and parts as described in the said specification, nor do I confine myself to the exact details of the construction of the said parts, as illustrated in the accompany ing drawings.

I claim 1. In a device of the class described, an abradiiig means, a work-supporting table arranged beneath the saine, means carried upon said tali-le for feeding the work to said abrading means, means providing a pivotal adjustment of said Table in a horizontal plane, means for causing' a transverse reciprocatioii of said` table, and ine-.ins for raising and lowering said table.

2. In a device of the class described, an abrading means, a vork-supporting tablearranged beneath the saine, means carried upon said table for feeding the work to said abrading'nieans, and means providing a pivotal adjustment of said table in a horizontal plane.

3;'In a device of the class described, an

abrading means, a work-supporting table arranged beneath the saine, work-feeding nieanscarried thereby, means for rotating :said work feeding means, means for reciprocating Asaid table-laterally, and means for raising and lowering said table.

` 4.111 a device of the class described, an abrading means, a work-supporting. table arranged beneath the saine lrmgitudinall \v of said abrading means, a plurality of diagonally disposed carricrshafts provided'witlicarrier-wheels arranged upon said table and beneath said abrading means, and means for rotating a portion of said carrier-shafts, to

carry the work in contact 'with said abrading means and 'simultaneously rotate the work on its longitudinal axis.

5. In a. device of the class described, an abrading means, a transversely reciprocating work-supporting table arranged beneath the same, means for raising and lowering said table, a pluralityof diagonally disposed .carrier-shafts provided with carrierwheels arranged v-upon said table, and means for rotating a portion of said carrier-shafts to carry the work iii contact with said abradin'g means and simultaneously rotate the Work on its longitudinal axis.

6.' In a.l device ofthe class described, a'n abrading means, a work-supporting table arranged beneath the same, a driving shaft provided with a plurality-of gears mounted upon said table,'means"for rotating said driving shaft, means for disconnecting said driving shaft from'its rotating means, a' plurality of diagonally disposed carriershafts provided withcarrier-wheels, Agears upon said carrier-shaftnormally,... meshing with the gears of said driving shaft,V and means for detachably supportingsaidcary lowering said table, a driving shaft ,pro-

vided with a plurality of gears mounted/ upon said table, means for` rotating said driving shaft, a plurality of diagonally disposed carrier shafts provided with gears normally meshing .withsaid gears upon said driving shaft, and a plurality of car,rierwheels fixed upon each carrier-shaft. j

S. In a device of the class described, an abrading means, a work-supporting table arranged beneath the same longitudinally of said abrading means, a driving shaft piovided with a plurality of gears mounted upon said table, mea-ns for rotating said driving shaft, a plurality of diagonally disposed carrier-shafts provided with gears normally meshing with saidgears upon said driving shaft, said. carriershafts being dispcsed beneath said abrading means, and a plurality of caiiiei'-\\'lieels tiived upon each carrier-shaft. 5

9. In a' device of the class described, an abrading means, a -worlcsupporting table'arranged beneathqthesame longitudinally of 4said abrading. means, a;plurality of diagol'nally disposed driven carrier-shafts provided with carrier-wheels arranged upon said table beneath said abradingnieans', and a plurality of diagonally disposed 'idler carrier-shafts provided with carrier-wheels arrangedupon said .table at the beginning and en'd of said plurality of driven carriershafts.-

10. In a device of the class described, an abrading means,- a transversely reciprocating work-supporting table arranged beneath .the same, means for raising and lowering with. gears normally meshing with said gears upon said driving shaft, a-plurality of carrier-wheels fixed u on each carrier-shaft, and means for detac ably-supporting said carrier-shafts in their geared.` relation to said driving shaft.

12. In a device of the class described, an abrading'means, a transversely reciprocating work-supporting table arranged beneathl the same, means for raising and lowering said table, a driving'shaft provided with a plurality of gears mounted upon said table, means for rotating said driving shaft, means for disconnecting said driving shaft from its rotating means, a plurality of diagonally disposed carriershafts provided with gears normally meshing with said geakrs upon said driving shaft,

a plurality of carrier-wheels'iixed upon each.

carrier-shaft, and means for detachably supporting said carrier-shafts in their geared relation to said drivingshaft, a plurality of diagonally disposed idler carrierf shafts detachably mounted upon said table at the beginning'and end of' said plurality of driven car'rier shafts, and a plurality of carrier-wheels fixed upon each idler carriershaft.

' 13. In a machine of the class described, a`

frame, a driving shaft, an abrading means ldriven thereby, -a work-supporting table,

- means connected with said frame for adjustably supporting said table with relation to said abrading means, means connected with said table supporting means for reciprocating said table laterally upon said supporting means, and connected through intermediate shaft.

14'. In a machine -Of the .dass desolata,-

a frame, a driving shaft, an. abradingmeans driven thereby, a table-beam provided with` laterally extending supporting'arms,n1eans for raising and' lowering sald table-beam, ,70 bed-brackets slidably arranged upon'the sup--. porting arms of said table-beam, fa .work-.

.supporting table adjustably, secured-.upon said bed-brackets, -a rock-shaft supported with relation to said tablebeam, levQlfa-rms.

upon said rock-shaft, connecting .rods con# e necting said lever-arms withfsaid -bedbrackets, a counter-balance weight. cc'mnect-` ed with said rock-shaft,-arroclter-arm, andaAIA y.

cam-member for operating Esaid rockerarm to oscillate said rock-shaft, -connected through intermediate mechanisml to said driving-shaft.

l5. In a machlne of .the class la,A

frame, a driving shaft, a Udriving pulley thereon, a pair of guide-pulleys bearing brackets in which said guide-,pulleys n are adjustably supported,. bracket-arms slid.. ably connected with saidframe-,-means for;

adjustably securing said bearing-brackets `to said bracket-arms, an abrasive belt runningv l over said .guide-pulleys,. atransversely corrugated cushioning belt runningpver said. i

driving pulley andone of said within said abrasive belt, an *means for upon' said bracket-arms to lm'alntain said guide pulleysv in a tensioning 'relationto said belts, comprising a rack carried'by each bracket-arm, shafts journaled in-saidframe, pinions upon each shaft'in engagement with said racks, la lever-arm pivoted upon each shaft, a dogupon one end -of eachlever arm, a second pinion upon each shaft en`- gaged by said dogs, and a weightadjust.-

ably secured upon the opposite iend of leach guide pulleys exerting an outwardly moving. pressure Y lever-arm. f A

16. In a machine ofthe lcharacter de-l scribed, a frame, -a driving shaft,l a driving .pulley thereon, a pair of yieldingly supported guide-pulleys connected with 'said l frame, lan abrasive belt running .over said guidepulleys, a cushioning belt running over said driving pulley and one of said guide pulleys within said abrasive belt, means for adjusting said guide-pulleys in horizontal and vertical planes, a work-su' Abelts run, means for adjusting said '.guidepulleys in a'horizontal plane, comprising a' bracket-bearing, a stationary bearing-block at one side of said bracket-bearing, a movable bearing-block at the other side of said bracket-bearing, a shaft carried by said ,respeetive bearing-blocks upon which the guide-pulley is -j'ouriialed, and means for moving said movable bearing-block to' swing saidshaft in a horizontal plane,

18. In a machine of t-lie'eliaractei described, a frame, an endless abrasive belt, a cushioning belt running within the same, means for supporting and driving said belts, a Work-supporting table arranged bei'ieatli the saine, rneans'carried by said table' for feeding the work to said abrasive belt, and means supported byl said frame for holding said abrasive belt and its cushioning belt vieldingly against the Work carried thereto by'said feeding means, comprising a framework, carrying-rods, upon said 'fiaineivoi'lc, retaining fingers extending upwardly. from said carrying-rods, a. plurality-of presserweights carried by Said carrying-rods, each presser-weight havingA an independent vertical movement upon its carrier-rod, but being retained against longitudinal movement by said retaining fingers, and means for raising and lowering said frame-work to carry said presser Weights awayv fromor into Operative contact with said cushioning and abrasive belts.

19. In a machine of the character described, an abrasive elemeiit,.nieans for holding said abrasive elementA yieldingly to its work, comprising afraine-work, carryingrods upon said frame-Work,retaining fingers extending upwardly from ,said carryingr'ods, a plurality of presser-Weights carried by said carrying-rods, each presser-Weight having an independent vertical movement upon its carrier-rod, but being retained against longitudinal movement by said 'r'etaining fingers, means for -raismg and lowering said frame-work to carry said presser- Weights away from or inio said operative contact With said abrasive element, and a pli'irality of auxiliary presser-weights adapted to be coperated with said fixed presser Weights, and retained in operative relation thereto by said relaining-imxji 20. In a device of the class described, an abrading means, a work-supporting table arranged beneath the saine longiliitlixially of said abiading means, :i drivingr shaft provided with a plurality of gears mounted upon said table, means for rotating said driving-shaft, a plurality of diagonally disposed carrier-shafts provided with gears normally meshing with said gears upon said driving-shaft, a plurality of cairier-wlieels fixed upon each carrier-shaft, and ineansfor detachably supporting said carrier-shafts in their geared relation to said driving-shafis,`

comp sing sleeves mounted to pivot or turn on said driving-shaft, off-set sockel bearings connected with said sleeves and adapted to -jonrnal the ends of said carrier-shafts, and

open bearing-members secured to said ivorlisupporting table adapted to journal the opposite ends of said carrier-shafts in such a manner as topermit of lifting out saidcarrier-shafts to free said opposite ends and thus permit the withdrawal of Said carriersliafts from said olf-set socket-bearings, and a disengagement of the geared relation of said carrier-shafts with said driving-sliaff,

Q1. ln a machine of the class described, :i

main frame, pulleys supported by said frame, an abrasive belt running over said pulleys, and a gravity presser 4foot engaging said abrasive belt, comprising a frame-work supported in yconnection ivith said main frame, a plurality ofpresser-iveights supported by said frame-work, each presseriveight possessing a free and independent vertical movement, and each presser-weight being' independently maintained in engageinent with said abrasive belt by the gravity of its uniss.

l'ii testimony, that Iclaiin the invention vset forth above l have li'ereiintset myl hand W itneises; K Y

GEORGE l). RICHARDS, ,A Fiiiiim. H. W. Finns'rzim 

